The recently published proceedings of the 41st Cologne Mediaevistentagung “Die Bibliothek – The Library – La Bibliothèque” contain an article by Dominik Trump and Karl Ubl entitled “Bibliotheca legum: Das Wissen über weltliches Recht im Frankenreich des 9. Jahrhunderts“. It deals with the digital indexing of legal manuscripts and also reflects on the legal knowledge of the Early Middle Ages based on the estimated numbers of lost manuscripts.